초록 ▼

A control system for a single-valve controlled medical ventilator adaptively invokes separate flow delivery or flow exhaust control functions in response to the sensed dynamic state of the ventilator without any dependence on measured patient parameters. The control system selects either the flow de

A control system for a single-valve controlled medical ventilator adaptively invokes separate flow delivery or flow exhaust control functions in response to the sensed dynamic state of the ventilator without any dependence on measured patient parameters. The control system selects either the flow delivery control system or flow exhaust control system based on a determination of the mode in which the ventilator is operating. The determination is made using a sensed ventilator operational parameter, such as the ratio of manifold pressure to flow output, to select the appropriate control function. A hysteresis routine is provided to prevent "hair triggering" between the flow delivery and flow exhaust control systems.

대표청구항 ▼

[ I claim:] [1.] A medical ventilator for providing gas to a ventilator connection in order to produce inhalation and exhalation ventilation cycles, said medical ventilator comprising:(a) a gas source;(b) a ventilator circuit communicating with the gas source for conveying gas to and away from the v

[ I claim:] [1.] A medical ventilator for providing gas to a ventilator connection in order to produce inhalation and exhalation ventilation cycles, said medical ventilator comprising:(a) a gas source;(b) a ventilator circuit communicating with the gas source for conveying gas to and away from the ventilator connection;(c) valve means for controlling the flow of gas in said ventilator circuit;(d) means for sensing an operational parameter which is indicative of a mode of operation of the ventilator, the ventilator operating in a flow delivery mode, or a flow exhaust mode;(e) processor means, operatively connected to the means for sensing, for controlling the valve means according to a signal from said means for sensing which represents said operational parameter, the processor means including:(i) a flow delivery control means for controlling the valve means when the ventilator is in the flow delivery mode;(ii) a flow exhaust control means for controlling the valve means when the ventilator is in the flow exhaust mode;(iii) means for adaptively selecting one of the flow delivery control means or the flow exhaust control means based on the signal from the said means for sensing;whereby the ventilator is capable of adaptively switching between the flow delivery and flow exhaust control means within a single breath of a patient depending on the mode of operation of the ventilator and independent of whether said ventilator is in said inhalation cycle or said exhalation cycle.